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I have an Bosch AQ125-HX tankless water heater. Its been great and the most i have had to do is sand of the carbon residue occassionally. However I seem to be having a problem with it going cold during a shower several times lately. Any idea what might be causing this? Thanks in advance.

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The first thing I would do is to clean the unit out. The instructions for this is in your manual. Sometimes this is just a matter of things getting clogged up and limiting the flow. The flow sensor itself may also be plugged up making it more difficult to sense the flow of water. The process for cleaning these things is really quite simple. It does take a little time though. You will probably need a bucket, Two hoses, and some food grade white vinegar. If this does not work, just let us know. Good Luck!

Posted on Jun 30, 2008

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Posted on Jan 02, 2017

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